Pitman for sewing-machines



(No Model.)

D. L. KEELER.

PITMAN FOR SEWING MAGHINBS.. No. 314,249. Patented Mar. 24, 1885.

WITNESSES a0 j INVENTOR and State of Michigan, have invented certain UNITED STATES PATENT OFFICE.

DAVID L. KEELER," OF GRAND RAPIDS, MICHIGAN.

PITMAN FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 314,249, dated March 24, I885.

Applicai ion filed September 17, 1884. (No model.)

To all whom it mayconcern:

Be it known that I, DAVID L. KEELER, a citizen of the United States, residing at the city of Grand Rapids, in the county of Kent new and useful Improvements in Sewing-Ma chines; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the pitman which connects the upper main shaft of a sewing-machine with the lower shaft of the same; and it consists in improved means for taking up the wear between the pitman and the roll-pin, and between the roll and wrist pins.

.In the accompanying draWings Figure l is a front view of a portion of a pitman con structed in accordance with my invention, showing also the wrist and roll pins. Fig. 2 is a side view'of the same. I

Like letters designate corresponding parts in all the figures.

The pitman A isconstructed with a longitudinallyextending slot, B,.in which plays the roll-pin G. .This roll-pin embraces the wrist-pin D, and is made in two parts, a a, so that it may be tightened up to take up the wear which takes place between the roll and wrist pins. To provide for thus tightening up, and at the same time to provide for taking up the wear between the-pitman and rollpin, the slot B of the pitman is at either end lengthened by means of a narrow Vshaped auxiliary slot, 1). The pitman is provided with two tightening-screws, E E, which are located on the pitman so as to cross the auxiliary slots 12 b, and as the screws are tightened they contract the auxiliary slots b b, and with them the main slot B, thus compensating the wear between the pitman and roll-pin, and between the roll-pin and the wrist-pin. The roll-pin C is held in position on the wristpin D by means of a flanged head, 0, formed on the two parts of the roll-pin, and by a nut, d, which screws onto the end of the wrist-pin.

I claim as my invention- 1. A pitman, A, provided with a slot, B, and with auxiliary slots 1) b, in combination with a roll-pin, O, which plays in the slot B. and adjusting-screws E E, which are adapted to contract the slots 1) b and B, and thereby take up the wear between the pitman and rollpin, substantially as set forth.

2. The combination of the pitman A, provided with slots 1) b B, the roll'pin 0, formed in two parts, a a, the wrist-pin D, and the ad justing-screws E E, substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID L. KEELER.

Witnesses:

' FRED W. Srnvnns,

ARTHUR O. DENISON. 

